The corresponding author doesn’t always communicate when the article is accepted. What should I do if I don’t find out the article is accepted within 3 months?

At the outset of collaborations you should make sure that all authors know that you are required to deposit the manuscript upon acceptance. If you do not receive the manuscript in time, you should send it to us as soon as you have it, but be aware that we may not be able to make it comply with REF Open Access requirements.